I haven't had any major problems (though the Cover Flow view is a bit glitchy). At first it was using a huge amount of CPU (my CPU meter was pegging at 70% with iTunes opened but not playing, load without iTunes was around 20%) but I walked away for a few hours and now it uses less CPU while playing than iTunes 6 used while idle. I figure it just needed some time to update the library and cache album covers (most of my mp3's already had them) and once that is done it behaves better.
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I haven't had any major problems (though the Cover Flow view is a bit glitchy). At first it was using a huge amount of CPU (my CPU meter was pegging at 70% with iTunes opened but not playing, load without iTunes was around 20%) but I walked away for a few hours and now it uses less CPU while playing than iTunes 6 used while idle. I figure it just needed some time to update the library and cache album covers (most of my mp3's already had them) and once that is done it behaves better.